chainComplex GradedModule -- make a chain complex from a graded module

chainComplex GradedModule -- make a chain complex from a graded module

Synopsis:

Function: chainComplex -- make a chain complex

Input:

an instance of class GradedModule.

Output:

an instance of class ChainComplex.

chainComplex M -- convert a graded module to a chain complex by installing the zero map as differential.

See also:

GradedModule -- the class of all graded modules

ChainComplex -- the class of all chain complexes

Code:

     -- ../../../Macaulay2/m2/chaincomplexes.m2:668-673
     chainComplex GradedModule := ChainComplex => (M) -> (
          C := new ChainComplex from M;
          b := C.dd = new ChainComplexMap;
          b.degree = -1;
          b.source = b.target = C;
          C)